Western Digital Purple PR1000M, Technical Reference Manual

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PR1000M
P
RODUCT
F
EATURES
2679-800020-A03 RELEASED 5/8/17 (WD CONFIDENTIAL) 17
with the pattern as a parameter—no data transfer is necessary. Write Same can write
the entire media, or just a portion of the media. The host can monitor the progress of
the Write Same by issuing SCT Status requests. This frees the host system to do other
tasks while the media is being cleared.
3.13.2 Temperature Reporting
The SCT Temperature Reporting (SCT TR) feature allows a host system to access
temperature information in the drive. The S.M.A.R.T. temperature value is reported
within ±3°C of the base casting temperature. This information can been used to
control fans or adjust the usage of various system components to keep the drive
within its normal operating temperature. Applications include Enterprise, Laptop,
Desktop and Consumer Electronics. SCT TR reports the maximum and minimum
sustained operating limits, warning level limits, and drive damage limits. In addition to
reporting the limits, SCT TR returns the current drive temperature (a temperature
history which the host can use to predict heating or cooling trends) and the maximum
temperature acheived during the lifetime of the drive as well as the highest
temperature achieved since the power was applied to the drive. Detailed information
on this capability can be found in ATA8-ACS.
3.14 World Wide Name (WWN)
It has become a critical requirement that hard drives be uniquely identified by
computer systems. This allows a drive to maintain its identity as it is transported from
system to system or placed on a network. IEEE has defined a format for serial numbers
that is widely recognized in the computing industry by adding World Wide Name
(WWN) to ATA/ATAPI-7 in 2002.
The World Wide Name (WWN) defined in ATA/ATAPI-7 is a modification of the IEEE
Extended Unique Identifier 64 bit standard (EUI-64) and is comprised of three major
components: naming authority, organizationally unique identifier (OUI) and serial
number. WD's OUI is 0014EEh.
3.15 Reliability Features Set
3.15.1 Data Lifeguard™
Representing WD's ongoing commitment to data protection, Data Lifeguard includes
features that enhance the drive’s ability to prevent data loss. Data Lifeguard data
protection utilities include thermal management, an environmental protection
system, and embedded error detection and repair features that automatically detect,
isolate, and repair problem areas that may develop over the extended use of the hard
drive. With these enhanced data reliability features, the drive can perform more
accurate monitoring, error repair, and deliver exceptional data security.
This self-tuning feature is performed during offline data collection scan. All user
sectors on the hard drive are scanned during times of no activity from the host. Any
sector determined to be written poorly (e.g., off-track), or that is difficult to recover
(e.g., because of a developing media defect or thermal asperity), is marked for repair.
Data Lifeguard actively guards your data, even if S.M.A.R.T. operations are disabled.
All WD drives are defect-free and low-level formatted at the factory. After prolonged
use, any drive, including a WD drive, may develop defects. If you continue receiving
data errors in any given file, use the Data Lifeguard Diagnostics utility to recover,
relocate and rewrite the user data to the nearest spare sector and maintain a
secondary defect list.
CAUTION: As with all format utilities, some options in the Data Lifeguard Diagnostics